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Crab Team in Washington State Report of 2016 Findings

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Crab Team in Washington State Report of 2016 Findings report of 2016 findings Crab Team in Washington State report of 2016 findings Prepared by Emily Grason Crab Team Program Coordinator Washington Sea Grant November 2017 November 2017 Report Prepared by Emily Grason Crab Team Program Coordinator [email protected] CONTENTS Infographic .................................................1 Summary..........................................................2 1. Monitoring Network ................. 3 2. Baited Trapping .................................4 3. Molt Surveys .........................................14 4. Habitat Transect Surveys .............17 Closing Thoughts .................................20 Note: Data presented here are in summary form only. Please contact Crab Team directly before reuse or for access to the raw data for additional analysis. COVER PHOTO CREDIT: EMILY GRASON 2 INFOGRAPHIC report of 2016 findings 1 Summary rab Team is a project of Washington Sea Grant in which volunteers conduct early-detection monitoring for European green crab (Carcinus maenas) across CWashington’s inland shorelines. Launched in 2015, Crab Team expanded to monitor 26 sites from Nisqually Reach to Bellingham, and as far west as the Dungeness River in 2016. Volunteers conduct monthly surveys that include baited trapping, molt searches and a habitat transect survey. While the primary goal of the project and monitoring protocols is to detect green crab at the earliest possible stage of invasion, volunteers collect data on all species observed during trapping and molt surveys. These data on native crabs, fishes and habitat features are the beginning of a longitudinal regional dataset on pocket estuary and salt marsh habitats in Washington’s Salish Sea. Information from these sites will provide valuable insight into the health and dynamics of these understudied habitats and the impacts that green crab could have on them. Here, we present a summary of Crab Team’s monitoring data from 2016 intended to highlight the contributions of the volunteers and the value of the dataset. The most notable finding in 2016 was the capture of a European green crab by Crab Team volunteers in Westcott Bay, on San Juan Island. Fortunately, the single green crab was only one of more than 57,000 organisms observed during surveys. These data offer a broad and rich opportunity for exploring local shorelines from ecological, conservation and stewardship perspectives. What follows are snapshots of Crab Team work during 2016, with brief interpretation of what the observed patterns might mean. As monitoring continues, and multiple years of data are assembled, we will be able to gain more insight into seasonal patterns and temporal trends. As Crab Team is a true collaboration with volunteers, we invite discussion. For more information on Crab Team, including survey protocols, visit the website: wsg.washington.edu/crabteam or email [email protected]. 2 1. Monitoring Network uget Sound, the Strait of Juan de Fuca and the a needle in a haystack. Monitoring sites are selected San Juan Islands together constitute Washington’s based on suitability for green crab survival, availability PSalish Sea, which has nearly 2,500 miles of of monitors and proximity to other sites. Crab Team shoreline. It’s no exaggeration to say that looking for monitored 26 sites in 2016, and identified 183 as a single, or even a few, green crab is like looking for potentially suitable habitat for green crab (Figure 1). report of 2016 findings Sooke Basin, BC Green crab detected in 2012 Suitable Habitat Medium and High habitat suitability Medium High Crab Team monitoring sites (26) Figure 1. Map of suitable habitat for European green crab, and Crab Team monitoring sites during 2016. 3 2. Baited Trapping ach month, monitors set six baited traps— three each of cylindrical minnow and square EFukui styles—for an overnight soak. All native organisms are identified and counted before being released, so Crab Team can compare the ecological Highlights communities of organisms that live at sites and how they change over the season. • A total of 828 traps were set in 2016, totaling 18,696 soak hours (779 days). This section provides some insight into what Crab Team captured in traps, as well as patterns of • Of 44,216 organisms, and 25 species, abundance and diversity across the 26 monitoring only a single European green crab was sites during 2016. We summarize the total catch by captured. species for the year in different ways. A species might be abundant, meaning large numbers are trapped • Trap catches were vastly dominated by (Table 1) , or it might be common (Table 2), meaning native hairy shore crab (Hemigrapsus it is found at many of the sites, or it might be both oregonensis), which were present at abundant and common. Exploring species abundance every single site. and commonness across all sites (Table 3) enables us to get at questions of diversity and ecosystem • Staghorn sculpin was the distant productivity. second-most abundant organism, but still found at nearly every site. • Both richness (number of species) and diversity are negatively correlated with total number of organisms trapped. That is, the more individual animals captured, the greater the dominance by hairy shore crab, and the fewer different types of animal captured. • The number of organisms caught that were not hairy shore crabs was fairly consistent across all sites. Totaled over the season, each site caught slightly fewer than 200 critters other than hairy PHOTO CREDIT: CRAIG STAUDE shore crab during 2016—regardless The first European green crab detected along of how many hairy shore crab were Washington’s inland shorelines was captured by Crab caught. Team volunteers at Westcott Bay in August 2016, and appears along with the other fish captured in the same trap. 4 Table 1. Trap Catch Totals by Species. Total number of each Table 2. Commonness of Animals Trapped. Number of sites species captured in trapping surveys across all sites and at which each species captured in trapping surveys was found months during the 2016 monitoring season. during 2016 monitoring season. Species 2016 Common Name # Trapped Taxon Species Common Name # Sites Where Type Captured Hemigrapsus oregonensis Hairy shore crab 41,006 (of possible 26) Leptocottus armatus Staghorn sculpin 1,505 Crab Hemigrapsus oregonensis Hairy shore crab 26 Cancer (Metacarcinus) gracilis Graceful crab 270 Fish Leptocottus armatus Staghorn sculpin 25 Nassarius fraterculus Japanese nassa 231 Crab Hemigrapsus nudus Purple shore crab 17 Hemigrapsus nudus Purple shore crab 228 Fish reportGasterosteus aculeatus ofThree-spined 2016 stickleback 13 findings Pagurus granosimanus Grainy-handed hermit crab 188 Crab Pagurus hirsutiusculus Hairy hermit crab 12 Gasterosteus aculeatus Three-spined stickleback 172 Fish Cymatogaster aggregata Shiner perch 12 Batillaria attramentaria Asian mud snail 167 Crab Pagurus granosimanus Grainy-handed hermit crab 8 Cancer (Metacarcinus) magister Dungeness crab 110 Crab Cancer (Metacarcinus) gracilis Graceful crab 6 Pagurus hirsutiusculus Hairy hermit crab 101 Snail Batillaria attramentaria Asian mud snail 6 Cottus asper Prickly sculpin 64 Crab Cancer (Metacarcinus) magister Dungeness crab 5 Cymatogaster aggregata Shiner perch 42 Fish Pholidae and Stichaeidae spp. Eel-like fishes (e.g. gunnels) 3 Haminoea sp. Bubble shell 34 Crab Cancer productus Red rock crab 2 Amphissa columbiana Wrinkled dove snail 27 Crab Multiple in Majidae Spider crabs 2 Cancer productus Red rock crab 22 Crab Telmessus cheiragonus Hairy helmet crab 2 Nassarius mendica Western lean nassa 14 Snail Haminoea sp. Bubble shell 2 Pholidae and Stichaeidae spp. Eel-like fishes (gunnels, pricklebacks, etc) 10 Fish Oligocottus maculosus Tidepool sculpin 1 Pandalidae and Hyppolytidae spp. Broken back shrimp 6 Fish Syngnathus leptorhynchus Bay pipefish 2 Multiple in Majidae Spider crabs 5 Crab Carcinus maenas European green crab 1 Oligocottus maculosus Tidepool sculpin 4 Crab Lophopanopeus bellus Black clawed crab 1 Telmessus cheiragonus Helmet crab 4 Shrimp Pandalidae & Hyppolytidae spp. Broken back shrimp 1 Syngnathus leptorhynchus Bay pipefish 3 Snail Amphissa columbiana Wrinkled dove snail 1 Carcinus maenas European green crab 1 Snail Nassarius fraterculus Japanese nassa 1 Lophopanopeus bellus Black clawed crab 1 Snail Nassarius mendica Western lean nassa 1 Porichthys notatus Plainfin midshipman 1 Fish Cottus asper Prickly sculpin 1 Total 44,216 Fish Porichthys notatus Painfin midshipman 1 Fish Platichthys stellatus Starry flounder 1 5 6 Table 3. 2016 Trap Catch by Site. Total number of each species captured in trapping surveys by organism type and individual site during 2016 monitoring season. Crustaceans Fishes Gastropods Spider crabs Months Sampled Hemigrapsus nudus Cancer (Metacarcinus) gracilis Cancer (Metacarcinus) magister Cancer productus Majidae - cheiragonus Telmessus Lophopanopeus bellus Carcinus maenas hirsutiusculus Pagurus granosimanus Pagurus Broken back shrimp Leptocottus armatus Gasterosteus aculeatus Cymatogaster aggregata Cottus asper Eel-like fishes Oligocottus maculosus Sygnathus leptorhynchus notatus Porichthys Batillaria attramentaria Haminoea spp. Amphissa columbiana Nassarius fraterculus Nassarius mendica Site Site Name Region Hemigrapsus oregonensis TOTAL 362 Post Point Bellingham Bay 729 25 1 26 48 6 8 1 3 231 14 4 1,092 533 Westcott Bay San Juan Island 337 1 2 414 2 7 8 6 771 536 Third Lagoon San Juan Island 111 1 6 1 160 21 2 15 6 317 330 Mud Bay San Juan Island 696 13 9 109 18 13 1 103 6 962 341 Crandall Spit Fidalgo
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